WO2014090145A1 - Circuit over-voltage protection and voltage relief system of pressurized water reactor nuclear power plant - Google Patents

Circuit over-voltage protection and voltage relief system of pressurized water reactor nuclear power plant Download PDF

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Publication number
WO2014090145A1
WO2014090145A1 PCT/CN2013/089031 CN2013089031W WO2014090145A1 WO 2014090145 A1 WO2014090145 A1 WO 2014090145A1 CN 2013089031 W CN2013089031 W CN 2013089031W WO 2014090145 A1 WO2014090145 A1 WO 2014090145A1
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Prior art keywords
voltage
regulator
electric
relief
power plant
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PCT/CN2013/089031
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French (fr)
Chinese (zh)
Inventor
王保平
任云
赖建永
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中国核动力研究设计院
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Publication of WO2014090145A1 publication Critical patent/WO2014090145A1/en
Priority to ZA2015/05014A priority Critical patent/ZA201505014B/en

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C9/00—Emergency protection arrangements structurally associated with the reactor, e.g. safety valves provided with pressure equalisation devices
    • G21C9/004—Pressure suppression
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D3/00—Control of nuclear power plant
    • G21D3/04—Safety arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention belongs to the technical field of accident response of a pressurized water reactor nuclear power plant, and particularly relates to a primary circuit overpressure protection and pressure relief system of a pressurized water reactor nuclear power plant.
  • the object of the present invention is to provide a primary circuit overpressure protection and pressure relief system for a pressurized water reactor nuclear power plant, which can realize primary circuit overpressure protection and normal pressure relief function during normal operation of the system, and can be operated under severe accident conditions. , to achieve rapid pressure relief of the primary circuit, to prevent high pressure fuses.
  • a primary circuit overpressure protection and pressure relief system for a pressurized water reactor nuclear power plant including a voltage regulator, a depressurization tank line, a regulator safety raft, and a plurality of pneumatic isolation rafts and electric Isolation ⁇ , wherein a regulator safety ⁇ is provided on the pipeline connected to the de-relieving tank line on the voltage regulator, and three parallel lines are arranged on the pipeline connecting the regulator to the de-relieving tank line
  • the branch road wherein the first branch comprises a series of electrically isolated ⁇ A and a pneumatic isolation ⁇ A, the second branch comprises a series of electrically isolated ⁇ B and a pneumatic isolation ⁇ B, and the third branch comprises a series of electrically isolated ⁇ C And pneumatic isolation ⁇ C.
  • the regulator safety device includes two parallel spring-type regulators, safety ⁇ A and spring-type stabilization.
  • Pressure regulator safety ⁇ B, spring-type regulator safety ⁇ A and spring-type regulator safety ⁇ B are connected in parallel to the regulator and the line connecting the pressure relief tank line.
  • the voltage regulator is further provided with two parallel quick decompression branches on the pipeline connected to the de-relieving pressure tank pipeline, wherein the first quick relief branch includes an electric brake A and an electric cut-off A, 2.
  • the quick relief branch includes the electric brake B and the electric cut-off ⁇ B.
  • the two quick relief branches are closed. Under severe accident conditions, the two quick relief branches are opened. , Perform the discharge pressure relief function.
  • the significant effect of the present invention is: a primary circuit overpressure protection and pressure relief system of a pressurized water reactor nuclear power plant according to the present invention, capable of performing overpressure protection under normal operating conditions, base accidents and severe accident conditions of a nuclear power plant Pressure relief function to maintain the safe state of the reactor.
  • FIG. 1 is a schematic view of a primary circuit overpressure protection and pressure relief system of a pressurized water reactor nuclear power plant according to the present invention
  • a primary pressure overpressure protection and pressure relief system for a pressurized water reactor nuclear power plant including a voltage regulator 1, a pressure relief tank line 2, a spring-loaded regulator safety ⁇ A3, a spring-loaded regulator Safety ⁇ B4, as well as several pneumatically isolated ⁇ and electrically isolated ⁇ , where the regulator 1 is secured by two parallel spring-loaded regulators ⁇ A3 and spring-loaded regulator safety ⁇ B4 and de-pressure tank line 2 Connected, in normal In operation, the spring-loaded regulator safety ⁇ A3 and the spring-loaded regulator safety ⁇ B4 are off, the reactor coolant system pressure rises to the spring-loaded regulator safety ⁇ A3 and the spring-loaded regulator safety ⁇ B4 The setting of the spring regulator safety ⁇ A3 and the spring regulator safety ⁇ B4 open the discharge, after the steam is discharged, the system pressure is reduced, when the system pressure is reduced to the spring regulator safety ⁇ A3 and spring-loaded regulator Safety ⁇ When B4 is off the pressure, the spring-loaded regulator safety ⁇ A
  • the voltage regulator 1 is connected to the de-relieving tank line 2 through a plurality of electric isolation rafts and pneumatic isolation rafts, thereby realizing pressure relief, low temperature overpressure protection and "charge-discharge" function of the primary circuit system, wherein
  • the voltage regulator 1 is connected to the de-relieving tank line 2 through three parallel branches, wherein the first branch comprises a series of electrically isolated ⁇ A5 and a pneumatic isolation ⁇ A6, and the second branch comprises a series of electrically isolated ⁇ B7 and pneumatic isolation ⁇ B8, the third branch includes series electric isolation ⁇ C9 and pneumatic isolation ⁇ C10; each pneumatic isolation ⁇ upstream of the normally open electric isolation ⁇ , when each pneumatic isolation ⁇ is opened, the pressure reaches the closing In the case of a value, if the pneumatic isolation ⁇ cannot be closed, the electric isolation ⁇ can be turned off to prevent the reactor coolant system pressure from continuing to drop; during normal operation of the system, the pneumatic isolation ⁇ is closed, once the system pressure rise
  • pneumatic isolation ⁇ When the system pressure is reduced to the closing pressure setting value of the pneumatic isolation , pneumatic isolation ⁇ automatically closes.
  • Two parallel quick relief branches are also mounted on the regulator 1, wherein the first quick relief branch includes an electric brake ⁇ Al l and an electric cut-off ⁇ A12, and the second quick relief branch includes an electric brake ⁇ B13 and electric cut-off ⁇ B14; During the normal operation of the system, the two quick relief branches are closed. Under severe accident conditions, the two quick relief branches are opened to perform the discharge relief function.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Safety Valves (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Abstract

A circuit over-voltage protection and voltage relief system of a pressurized water reactor nuclear power plant comprises a voltage stabilizer (1), a voltage removal and relief box pipeline (2), and a voltage stabilizer safety valve and a plurality of pneumatic isolating valves and electric isolating valves. The voltage stabilizer safety valve is disposed on a pipeline connected to the voltage removal and relief box pipeline (2), of the voltage stabilizer (1), and three parallel branch circuits are disposed on the pipeline connected to the voltage removal and relief box pipeline (2), of the voltage stabilizer (1). A first branch circuit comprises an electric isolating valve A (5) and a pneumatic isolating valve A (6) serially connected, a second branch circuit comprises an electric isolating valve B (7) and a pneumatic isolating valve B (8) serially connected, and a third branch circuit comprises an electric isolating valve C(9) and a pneumatic isolating valve C (10) serially connected. The system can perform over-voltage protection and voltage relief functions in working conditions where the nuclear power plant is in normal operation or a basic accident or a serious accident occurs, so as to ensure the safe state of the reactor.

Description

压水堆核电厂一回路超压保护及卸压系统 技术领域  Primary circuit overpressure protection and pressure relief system for pressurized water reactor nuclear power plant
本发明属于压水堆核电厂事故应对技术领域， 具体涉及一种压水堆核电 厂一回路超压保护及卸压系统。  The invention belongs to the technical field of accident response of a pressurized water reactor nuclear power plant, and particularly relates to a primary circuit overpressure protection and pressure relief system of a pressurized water reactor nuclear power plant.
背景技术  Background technique
目前先进压水堆核电厂在系统中需要考虑设置执行一回路超压保护、 卸 压、 严重事故工况下快速卸压、 低温超压保护以及系统的 "充-排 "功能的装 置。 而国内外现有的压水堆核电厂的一回路超压保护及卸压系统不能完全满 足上述要求。  At present, the advanced PWR nuclear power plant needs to consider the installation of one-circuit over-pressure protection, unloading, rapid pressure relief under severe accident conditions, low-temperature over-pressure protection, and the system's "charge-discharge" function. The primary circuit overpressure protection and pressure relief system of existing PWR nuclear power plants at home and abroad cannot fully meet the above requirements.
发明内容  Summary of the invention
本发明的目的在于提供一种压水堆核电厂一回路超压保护及卸压系统， 可以在系统正常运行时， 实现一回路超压保护和正常卸压功能， 并可在严重 事故工况下， 实现对一回路的快速卸压， 防止高压熔堆。  The object of the present invention is to provide a primary circuit overpressure protection and pressure relief system for a pressurized water reactor nuclear power plant, which can realize primary circuit overpressure protection and normal pressure relief function during normal operation of the system, and can be operated under severe accident conditions. , to achieve rapid pressure relief of the primary circuit, to prevent high pressure fuses.
本发明的技术方案如下：一种压水堆核电厂一回路超压保护及卸压系统， 该系统包括稳压器、 去卸压箱管线、 稳压器安全闽， 以及若干气动隔离闽和 电动隔离闽， 其中， 在稳压器上与去卸压箱管线连接的管路上设有稳压器安 全闽， 且在稳压器与去卸压箱管线相连接的管路上还设有三个并列支路， 其 中， 第一支路包括串联的电动隔离闽 A和气动隔离闽 A， 第二支路包括串联 的电动隔离闽 B和气动隔离闽 B，第三支路包括串联的电动隔离闽 C和气动 隔离闽 C。  The technical scheme of the present invention is as follows: a primary circuit overpressure protection and pressure relief system for a pressurized water reactor nuclear power plant, the system including a voltage regulator, a depressurization tank line, a regulator safety raft, and a plurality of pneumatic isolation rafts and electric Isolation 闽, wherein a regulator safety 闽 is provided on the pipeline connected to the de-relieving tank line on the voltage regulator, and three parallel lines are arranged on the pipeline connecting the regulator to the de-relieving tank line The branch road, wherein the first branch comprises a series of electrically isolated 闽A and a pneumatic isolation 闽A, the second branch comprises a series of electrically isolated 闽B and a pneumatic isolation 闽B, and the third branch comprises a series of electrically isolated 闽C And pneumatic isolation 闽C.
所述的稳压器安全闽包括两个并列的弹簧式稳压器安全闽 A和弹簧式稳 压器安全闽 B，弹簧式稳压器安全闽 A和弹簧式稳压器安全闽 B并列接入稳 压器与去卸压箱管线连接的管路上。 The regulator safety device includes two parallel spring-type regulators, safety 闽A and spring-type stabilization. Pressure regulator safety 闽B, spring-type regulator safety 闽A and spring-type regulator safety 闽B are connected in parallel to the regulator and the line connecting the pressure relief tank line.
所述的稳压器与去卸压箱管线连接的管路上还设有两个并列的快速卸压 支路， 其中， 第一快速卸压支路包括电动闸闽 A和电动截止闽 A， 第二快速 卸压支路包括电动闸闽 B和电动截止闽 B， 在系统正常运行过程中， 两支快 速卸压支路处于关闭状态， 在严重事故工况下， 两支快速卸压支路开启， 执 行排放卸压功能。  The voltage regulator is further provided with two parallel quick decompression branches on the pipeline connected to the de-relieving pressure tank pipeline, wherein the first quick relief branch includes an electric brake A and an electric cut-off A, 2. The quick relief branch includes the electric brake B and the electric cut-off 闽B. During the normal operation of the system, the two quick relief branches are closed. Under severe accident conditions, the two quick relief branches are opened. , Perform the discharge pressure relief function.
本发明的显著效果在于： 本发明所述的一种压水堆核电厂一回路超压保 护及卸压系统， 能够在核电厂正常运行、 基准事故以及严重事故工况下执行 其超压保护和卸压的功能， 以维持反应堆的安全状态。  The significant effect of the present invention is: a primary circuit overpressure protection and pressure relief system of a pressurized water reactor nuclear power plant according to the present invention, capable of performing overpressure protection under normal operating conditions, base accidents and severe accident conditions of a nuclear power plant Pressure relief function to maintain the safe state of the reactor.
附图说明  DRAWINGS
图 1 为本发明所述的一种压水堆核电厂一回路超压保护及卸压系统示意 图；  1 is a schematic view of a primary circuit overpressure protection and pressure relief system of a pressurized water reactor nuclear power plant according to the present invention;
图中： 1、 稳压器； 2、 去卸压箱管线； 3、 弹簧式稳压器安全闽 A; 4、 弹簧式稳压器安全闽 B; 5、 电动隔离闽 A; 6、 气动隔离闽 A; 7、 电动隔离 闽 B; 8、 气动隔离闽 B; 9、 电动隔离闽 C; 10、 气动隔离闽 C; 11、 电动闸 闽 A; 12、 电动截止闽 A; 13、 电动闸闽 B; 14、 电动截止闽 B。  In the figure: 1. Voltage regulator; 2. De-pressure tank line; 3. Spring-type regulator safety 闽A; 4. Spring-type regulator safety 闽B; 5. Electric isolation 闽A; 6. Pneumatic isolation闽A; 7, electric isolation 闽B; 8, pneumatic isolation 闽B; 9, electric isolation 闽C; 10, pneumatic isolation 闽C; 11, electric brake 闽A; 12, electric cut-off 闽A; 13, electric brake B; 14, electric cut-off 闽B.
具体实施方式 下面结合附图及具体实施例对本发明作进一歩详细说明。  DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
如图 1所示， 一种压水堆核电厂一回路超压保护及卸压系统， 包括稳压 器 1、 去卸压箱管线 2、 弹簧式稳压器安全闽 A3、 弹簧式稳压器安全闽 B4， 以及若干气动隔离闽和电动隔离闽， 其中， 稳压器 1通过两个并连的弹簧式 稳压器安全闽 A3和弹簧式稳压器安全闽 B4与去卸压箱管线 2连接，在正常 运行时， 弹簧式稳压器安全闽 A3和弹簧式稳压器安全闽 B4处于关闭状态， 在反应堆冷却剂系统压力升高到弹簧式稳压器安全闽 A3和弹簧式稳压器安 全闽 B4的整定值时弹簧式稳压器安全闽 A3和弹簧式稳压器安全闽 B4开启 排放， 蒸汽排出后， 系统压力降低， 当系统压力降低到弹簧式稳压器安全闽 A3和弹簧式稳压器安全闽 B4关闭压力时， 与稳压器 1相连接的弹簧式稳压 器安全闽 A3和弹簧式稳压器安全闽 B4自动关闭。稳压器 1通过若干个电动 隔离闽和气动隔离闽与去卸压箱管线 2相连， 实现对一回路系统的卸压、 低 温超压保护和一回路系统的 "充 -排"功能， 其中， 稳压器 1通过三个并列支 路与去卸压箱管线 2相连接， 其中， 第一支路包括串联的电动隔离闽 A5和 气动隔离闽 A6， 第二支路包括串联的电动隔离闽 B7和气动隔离闽 B8， 第 三支路包括串联的电动隔离闽 C9和气动隔离闽 C10; 每个气动隔离闽上游 串联的常开电动隔离闽， 当每个气动隔离闽开启后压力达到关闭定值时， 如 果气动隔离闽不能关闭时， 可以通过关闭电动隔离闽， 以防止反应堆冷却剂 系统压力继续下降； 在系统正常运行时， 气动隔离闽处于关闭状态， 一旦系 统的压力升高到气动隔离闽的整定值时， 自动开启气动隔离闽实现一回路的 卸压， 当系统压力降低到气动隔离闽的关闭压力整定值时， 气动隔离闽自动 关闭。 在稳压器 1上还安装有两个并列的快速卸压支路， 其中， 第一快速卸 压支路包括电动闸闽 Al l和电动截止闽 A12 ,第二快速卸压支路包括电动闸 闽 B13和电动截止闽 B14; 在系统正常运行过程中， 两支快速卸压支路处于 关闭状态， 在严重事故工况下， 两支快速卸压支路开启， 执行排放卸压功能。 As shown in Figure 1, a primary pressure overpressure protection and pressure relief system for a pressurized water reactor nuclear power plant, including a voltage regulator 1, a pressure relief tank line 2, a spring-loaded regulator safety 闽A3, a spring-loaded regulator Safety 闽B4, as well as several pneumatically isolated 闽 and electrically isolated 闽, where the regulator 1 is secured by two parallel spring-loaded regulators 闽A3 and spring-loaded regulator safety 闽B4 and de-pressure tank line 2 Connected, in normal In operation, the spring-loaded regulator safety 闽A3 and the spring-loaded regulator safety 闽B4 are off, the reactor coolant system pressure rises to the spring-loaded regulator safety 闽A3 and the spring-loaded regulator safety 闽B4 The setting of the spring regulator safety 闽A3 and the spring regulator safety 闽B4 open the discharge, after the steam is discharged, the system pressure is reduced, when the system pressure is reduced to the spring regulator safety 闽A3 and spring-loaded regulator Safety 闽 When B4 is off the pressure, the spring-loaded regulator safety 闽A3 connected to the regulator 1 and the spring-loaded regulator safety 闽B4 are automatically turned off. The voltage regulator 1 is connected to the de-relieving tank line 2 through a plurality of electric isolation rafts and pneumatic isolation rafts, thereby realizing pressure relief, low temperature overpressure protection and "charge-discharge" function of the primary circuit system, wherein The voltage regulator 1 is connected to the de-relieving tank line 2 through three parallel branches, wherein the first branch comprises a series of electrically isolated 闽A5 and a pneumatic isolation 闽A6, and the second branch comprises a series of electrically isolated 闽B7 and pneumatic isolation 闽B8, the third branch includes series electric isolation 闽C9 and pneumatic isolation 闽C10; each pneumatic isolation 闽 upstream of the normally open electric isolation 闽, when each pneumatic isolation 闽 is opened, the pressure reaches the closing In the case of a value, if the pneumatic isolation 闽 cannot be closed, the electric isolation 闽 can be turned off to prevent the reactor coolant system pressure from continuing to drop; during normal operation of the system, the pneumatic isolation 闽 is closed, once the system pressure rises to pneumatic isolation When the setting value of 闽 is set, the pneumatic isolation 自动 is automatically turned on to realize the pressure relief of the primary circuit. When the system pressure is reduced to the closing pressure setting value of the pneumatic isolation ,, pneumatic isolation闽 automatically closes. Two parallel quick relief branches are also mounted on the regulator 1, wherein the first quick relief branch includes an electric brake 闽Al l and an electric cut-off 闽A12, and the second quick relief branch includes an electric brake闽B13 and electric cut-off 闽B14; During the normal operation of the system, the two quick relief branches are closed. Under severe accident conditions, the two quick relief branches are opened to perform the discharge relief function.

Claims

权 利 要 求  Rights request
1、一种压水堆核电厂一回路超压保护及卸压系统， 其特征在于： 该系统 包括稳压器 （1) 、 去卸压箱管线 （2) 、 稳压器安全闽， 以及若干气动隔离 闽和电动隔离闽， 其中， 在稳压器 （1) 上与去卸压箱管线 （2) 连接的管路 上设有稳压器安全闽， 且在稳压器 （1) 与去卸压箱管线 （2) 相连接的管路 上还设有三个并列支路， 其中， 第一支路包括串联的电动隔离闽 A (5)和气 动隔离闽 A (6) ， 第二支路包括串联的电动隔离闽 B (7) 和气动隔离闽 B 1. A primary circuit overpressure protection and pressure relief system for a pressurized water reactor nuclear power plant, characterized in that: the system comprises a voltage regulator (1), a depressurization tank line (2), a regulator safety device, and a plurality of Pneumatic isolating crucible and electric isolating crucible, where the regulator is connected to the line connecting the depressurizing tank line (2) on the regulator (1), and the regulator (1) and the unloading The pressure tank line (2) is also provided with three parallel branches on the connected pipeline, wherein the first branch includes a series of electric isolation 闽A (5) and a pneumatic isolation 闽A (6), and the second branch includes Series of electrically isolated 闽B (7) and pneumatic isolation 闽 B
(8) ， 第三支路包括串联的电动隔离闽 C (9) 和气动隔离闽 C (10) 。 (8) The third branch consists of a series of electrically isolated 闽 C (9) and a pneumatic isolation 闽 C (10).
2、 根据权利要求 1 所述的一种压水堆核电厂一回路超压保护及卸压系 统， 其特征在于： 所述的稳压器安全闽包括两个并列的弹簧式稳压器安全闽 A (3) 和弹簧式稳压器安全闽 B (4) ， 弹簧式稳压器安全闽 A (3) 和弹簧 式稳压器安全闽 B (4)并列接入稳压器 （1)与去卸压箱管线 （2)连接的管 路上。  2. The primary circuit overvoltage protection and pressure relief system of a pressurized water reactor nuclear power plant according to claim 1, wherein: said voltage regulator safety device comprises two parallel spring type regulators. A (3) and spring-loaded regulator safety 闽B (4), spring-loaded regulator safety 闽A (3) and spring-loaded regulator safety 闽B (4) side by side connected to the regulator (1) Go to the line connected to the pressure tank line (2).
3、 根据权利要求 1 所述的一种压水堆核电厂一回路超压保护及卸压系 统， 其特征在于： 所述的稳压器 （1) 与去卸压箱管线 （2) 连接的管路上还 设有两个并列的快速卸压支路，其中，第一快速卸压支路包括电动闸闽 AC11) 和电动截止闽 A (12) ， 第二快速卸压支路包括电动闸闽 B (13) 和电动截 止闽 B (14) ， 在系统正常运行过程中， 两支快速卸压支路处于关闭状态， 在严重事故工况下， 两支快速卸压支路开启， 执行排放卸压功能。  3. A primary circuit overpressure protection and pressure relief system for a pressurized water reactor nuclear power plant according to claim 1, wherein: said voltage regulator (1) is connected to a depressurization tank line (2) There are also two parallel quick relief branches on the pipeline, wherein the first quick relief branch includes an electric brake AC11) and an electric cutoff 闽A (12), and the second quick relief branch includes an electric brake B (13) and electric cut-off 闽B (14), during the normal operation of the system, the two quick relief branches are closed. Under severe accident conditions, the two quick relief branches are opened and the discharge is discharged. Pressure function.
PCT/CN2013/089031 2012-12-13 2013-12-11 Circuit over-voltage protection and voltage relief system of pressurized water reactor nuclear power plant WO2014090145A1 (en)

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